Compare The Magnificent, Everyone Calls Him "Barkeep", and Names to Run Away from Really Fast.I Have Many Names can be when they have more than one and They Call Him "Sword" when he's named after some kind of weapon.This may also be a sign that you're dealing with The Dreaded.
Subtrope to Nom de Guerre, where they the nickname, but they might not be particularly known or feared for it.
Virtually all of these example count as In-Series Nicknames.
Not to be confused with the 70s Tokusatsu and 90s Anime Super Robot show of the same name, or the frozen pizza brand of the same name.
Sometimes a character is so badass that they don't have just a name.
They have their own nickname, one that is so badass that anyone who hears it will crap their pants in fear.
If they occasionally show up, be prepared to hear this nickname spoken repeatedly whenever they rescue someone.
Named for the Ace Pilot, Manfred von Richthofen, who was known as "The Red Baron" during World War I.
He was best known for having the highest kill count of any flyer in the war and for his bright red Fokker tri-plane.
The full trope embodies two principles: Compare with Fan Nickname, where the fans come up with a nickname that isn't used in the series.
The Butcher is a subtrope where the nickname typically refers to the character's violent nature or dark acts.
Superhero Sobriquets is the superheroic counterpart to this trope.